South Meath was a UK Parliament constituency in Ireland, returning one Member of Parliament (MP) from 1885 to 1922.

Prior to the 1885 general election the area was part of the Meath (UK Parliament constituency). From 1922, on the establishment of the Irish Free State, it was not represented in the UK Parliament.

This constituency comprised the southern part of County Meath.

1885–1922: The baronies of Deece Lower, Deece Upper, Duleek Lower, Duleek Upper, Dunboyne, Lune, Moyfenrath Lower, Moyfenrath Upper, Navan Upper and Ratoath, that part of the barony of Navan Lower contained within the parishes of Churchtown and Rataine, and that part of the barony of Skreen not contained within the constituency of North Meath.